Słownik
- Hair blockage — Drain blockage caused by hair binding with soap residue inside bath and shower wastes.
- Hairdressing salon — Hair and beauty premises with basin chairs, hair clog risk and small commercial drainage.
- HDPE pipe (high-density polyethylene) — Tough black plastic pipe used for above ground stacks and adopted sewer rising mains.
- Health and Safety at Work Act 1974 — Primary UK legislation establishing duties to protect health and safety in work activities.
- Hemp (plumbing jointing) — Traditional natural fibre used with linseed paste to seal threaded plumbing joints.
- High-pressure jetter (HPW) — Machine that delivers pressurised water through nozzles to clean drains.
- High-pressure water jetting (hydro-jetting) — Cleaning method using pressurised water to scour pipe walls and clear blockages.
- Highway drain survey (s.50) — Survey of drainage affected by highway works, typically required under section 50 licensing.
- Homebuyer drain survey — Standard pre-purchase CCTV drain survey with concise report for homebuyers.
- Hospital drainage emergency — NHS or private hospital drainage emergency, with infection control and rapid response priority.
- Hospital kitchen — NHS or private hospital catering kitchen with 24/7 drainage demand and infection control.
- Hot cure lining — CIPP lining cured by circulating heated water through the inflated liner.
- Hot water jetter — Jetter that heats the working water to soften grease and improve cleaning efficiency.
- Hot-melt sealant — Bitumen-based jointing compound applied molten to seal manhole covers and chamber rings.
- Hotel kitchen — Large commercial kitchen serving guests, with high drainage loads and grease management.
- Housing association property — Property owned by a registered housing provider, with association-managed drainage works.
- Hydraulic test — Generic term for any test using water under controlled pressure or flow to verify drains.
